PHP is an open source server side scripting language designed to produce dynamic web pages. It is one of the first developed server side scripting languages to be embedded into an HTML source document rather than calling an external file to process data. It is probably the simplest programming language providing flexibility to the users, making it accepted by a large number of programmers worldwide.

Advantages :

Faster implementation of solutions making the development time of an application reduce and thus provide cost efficiency and a greater degree of competitive advantage.

Can run faster on internet and easily interfaces with Apache/Mysql.

The application developed using PHP can run on cross platforms (Windows, Linux or Mac Servers) and can easily be integrated with other technologies making it suitable for reusable cases.

It offers greater flexibility in terms of future after development enhancements.

Attractive dynamic websites can be created using PHP, which makes sure more visitors come to the site and spent more time over there, which in turn increases the business revenue.

PHP can easily be embedded with a static webpage at any point of time.

Other web based tools like Google Maps etc. can easily be accessed through PHP.